An activity status information computation system includes: a first information acquisition unit which acquires measured biometric information measured about a user； a second information acquisition unit which acquires personal biometric setting information set as personal information of the user； and a processing unit which carries out computation processing of activity status information of the user on the basis of the measured biometric information and the personal biometric setting information. when there is an alteration request about the personal biometric setting information, the processing unit carries out decision processing about a timing of reflecting the alteration of the personal biometric setting information on the computation processing of the activity status information, or decision processing about whether to reflect the alteration or not, according to an attribute of the personal biometric setting information.
